Right? With an army that size, you'd be able to see the dust they kick up just from marching at least a half a day out. You'd literally have to have teleportation magic capable of simultaneously moving tens, if not hundreds, of thousands at once to manage it.
Which we know they don't have, or...
See, Ibuki? This is why you should have learned the wisdom of "none of my fucking business". Reo's affair was not only not harming the team (so far), it was helping it.
What's better for the world? An adulterous dude helping others defeat monsters and saving lives or exposing said adultery and...
To be fair (to the students, not him; fuck him), he'd also likely pre-conditioned them to fear him by being the general cunt he was back on Earth; there's no way in hell he didn't abuse his father being a school exec (forget his actual position) to get away with terrorizing the student body...
Eh, I could see that going horribly, to be honest; we were shown a panel of citizens reacting to him returning alone, with them fearfully wondering if the demon king was even dead. Telling the public "hey, demon king's dead, but he killed the other heroes in the process" would just cause mass...
Oh, you mean exactly what that stuck up cumstain of a noble was doing? To say nothing of the fact he was going to publicly murder a child.
So who's going to keep the fuckwit who started it (and, again, was going to publicly murder a child) in check?
Fuck off with that nonsense, you feckless...